TECHNICAL PAPERS: Bubbles, Particles, and Droplets

Measurement of Temperatures on In-Flight Water Droplets by Laser Induced Fluorescence Thermometry

[+] Author and Article Information
V. M. Salazar

Department of Mechanical Engineering, University of Puerto Rico, Mayaguez 2, PR 00681-9045

J. E. González

Department of Mechanical Engineering, Santa Clara University, Santa Clara, CA 95053

L. A. Rivera

Department of Chemistry, University of Puerto Rico-Mayagüez, Mayaguez, PR 00681-9019

J. Heat Transfer 126(2), 279-285 (May 04, 2004) (7 pages) doi:10.1115/1.1667527 History: Received August 22, 2002; Revised December 15, 2003; Online May 04, 2004
Copyright © 2004 by ASME
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Grahic Jump Location
Typical fluorescence emission spectra for an excimeric solution. In this case the solution is 5 mM pyrene in ethanol at ambient temperature.
Grahic Jump Location
(Left superior corner) Atomizer and orifice plate, (Right) Schematic diagram of the experimental setup for droplet temperature measurements
Grahic Jump Location
Simultaneous observation of the stream of droplets at two different wavelengths range, the monomer and the red shifted excimer in a gray false color
Grahic Jump Location
Emission spectra taken in a fluorescence spectrophotometer for the water pyrene/CDBAC/water solution at 5 mM concentration of both pyrene and CBBAC, with excitation wavelength at λ=337 nm
Grahic Jump Location
LIF thermometry calibration curves for a pyrene/CDBAC/water solution at 5 mM concentration from data collected at a fluorescence spectrophotometer (continuous line refers to the heating process and the dots to the cooling process), and in-situ calibration curve developed with the spray experimental setup
Grahic Jump Location
Experimental temperature measurements [dots] for a single stream of in-flight water droplets (200 μm in diameter) doped with pyrene/CDBAC dye at 5 mM concentration, and a comparison with results of a theoretical model (solid lines), for initial temperatures of 30, 40, and 50°C



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